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复数所对应的点的轨迹方程为___________
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A. x2-y2=1 B. x2-y2=1 (y≠0)
C. x2+y2=1 D. x2-y2=0
(1)求P点的轨迹方程;
(2)若向量对应复数为z′,求z′所对应的点的轨迹方程.